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Electrochromic display dot drive matrix

  • US 5,049,868 A
  • Filed: 09/19/1989
  • Issued: 09/17/1991
  • Est. Priority Date: 09/19/1989
  • Status: Expired due to Fees
First Claim
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1. A planar matrix of electrochromic display dot drive picture elements, wherein:

  • a) each picture element comprises;

    1) a drive transistori) connected between a planar drive electrode, common to all picture elements, and the display dot andii) connected for turning on in response to the application of a turn-on voltage to a control terminal, and for turning off in response to the application of a turn-off voltage to the control terminal;

    2) a capacitor connected between the drive electrode and the control terminal;

    3) a planar counter electrode common to all picture elements, connected to the drive electrode through an electric power source; and

    4) means for selectively connecting the control terminal and capacitor to, or insulating them from, a turn-on/turn-off voltage source;

    b) the display dot and the counter electrode are so situated and constructed that, when the drive transistor is turned on, it impresses the display dot with electricity from the electric power source sufficient to change the color of the display dot; and

    c) the display dots are situated to be simultaneously viewed by an observer off the plane of the matrix.

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